Task 1 is no longer working (python, use split and join)

Without seeing your code, it's impossible to help troubleshoot. But that error is a bit misleading. 99% of the time, that error is raised because a syntax error has been introduced into the code. So, if you say you get it when you try to complete Task 3, then the code you are putting in for Task 3 probably has a syntax error that is causing the code checker to throw the "Task one no longer passing." With this being Python, it a good chance that it is probably an indentation error. Double check your code for Task 3, and if you're still stuck, you will need to post the code for us to better help.

If copy / pasting code here, make sure you read the Markdown Cheatsheet of proper formatting so the code is readable. Or if you are asking questions right from the challenge, just make sure the "include code" box is checked.

Dear Marcel it's not possible to help you without seeing your code but here is the answer :

available = "banana split;hot fudge;cherry;malted;black and white"
sundaes = available.split(';')
menu = ("Our available flavors are: {}." ).format(", ".join(sundaes))

I'm sorry for not adding the code I tried various versions like

available = "banana split;hot fudge;cherry;malted;black and white"
sundaes = available.split(";")
menu = "Our available flavors are: {}."
display_menu = sundaes.join(", ")
menu = menu.format(display_menu)

or with changing the .format up to the original menu

menu = "Our available flavors are: {}.".format(display_menu)
display_menu = sundaes.join(", ")

and other things, but it just dont want to work

well, since I ran out of imagination, I just used your soluton pouya, thank you but I am still unable to figure out why my solutions aren't working... btw. in your solution it works fine, but if i try

display_menu = ", ".join(sundaes)

instead of

display_menu = sundaes.join(", ")

I just get another error, dont know why the order is ok with the long line, but not with the short one...